In the theater scene immediately following meeting with Alice, Ivan sports an entirely new hair do. The play's director acknowledges it. Then the very next scene has Ivan exiting the subway station with his old hair do.
When Ivan and Alice meet at the plaza, Alice has 3 glasses of champagne and 3 aspirin in front of her, which she sips from and swallows during the conversation. She takes more than 3 aspirin, although 3 are clearly shown. And the liquid levels in the champagne glasses change from shot to shot.